Nervous system issues and Mono

I've had re-activated Mononucleosis and haven't had it since early March. Since February I've gone through absolute hell. I've lost 16 pounds over the course of 2 months and have had nausea almost all day that gets worse whenever I think about it and don't have my mind occupied with something. I stare at the computer and TV but my sickness is all I think about. I have extreme anxiety and almost panic attacks because I'm so afraid of feeling awful. Because of this persisting nausea I just had a colonoscopy and upper endoscopy done yesterday. From what the doctor saw, there was nothing wrong. My biopsy results will be back in 1 week but if there was anything majorly wrong, he would've seen it. I just started taking anxiety pills to calm my nerves as he thinks the mono has "whacked out" my nervous system. If anyone has any idea what's wrong with me, please tell me.